A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of bullet is : (Given : initial temperature of the bullet = 127$^\circ$C, Melting point of the bullet = 327$^\circ$C, Latent heat of fusion of lead = 2.5 $\times$ 104 J kg$-$1, Specific heat capacity of lead = 125 J/kg K)

Question

A lead bullet penetrates into a solid object and melts. Assuming that 40% of its kinetic energy is used to heat it, the initial speed of bullet is :

(Given : initial temperature of the bullet = 127$^\circ$C, Melting point of the bullet = 327$^\circ$C, Latent heat of fusion of lead = 2.5 $\times$ 10⁴ J kg^$-$1, Specific heat capacity of lead = 125 J/kg K)

125 ms^$-$1

500 ms^$-$1

250 ms^$-$1

600 ms^$-$1

Solution

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